Circuit analysis current source problem

[Jamessamuel]

Homework Statement

given the circuit shown, find V1.

Homework Equations

The Attempt at a Solution

see image:
am i right? Video says otherwise... I chose to use the superposition theorem here.

help appreciated,

regards,

james.

 

[SammyS]

Homework Statement

given the circuit shown, find V1.
[ ATTACH=full]91899[/ATTACH]

Homework Equations

The Attempt at a Solution

see image:
am i right? Video says otherwise... I chose to use the superposition theorem here.
[ ATTACH=full]91898[/ATTACH]

help appreciated,

regards,

james.

That second image is very difficult to read.

It appears that you took the 80Ω and 120Ω to be a parallel combination, which is correct. However, that combination is NOT in series with the 8Ω resistor.

 

[insightful]

However, that combination is NOT in series with the 8Ω resistor.

I think they're considered in series for getting the current through them when the 1A supply is ignored, but must be separated to get individual resistor voltage drops. Once all individual voltage drops are gotten they are then combined (superpositioned?) for the answer.

 

[Jamessamuel]

surely this is correct?

 

[SammyS]

surely this is correct?
[ ATTACH=full]91916[/ATTACH]

That's fine for the 6A source.

There is a different parallel/series combination you need to use for the 1A source. For this, there is no 56Ω combination.

(Thanks, insightful.)

Added in Edit:
The above refers to the following:

The 40Ω and 8Ω are in series.
That combination and the other two resistors, 80Ω and 120Ω, are all in parallel with the other.